Nathan decided on a mystery movie. He grabbed the remote and picked one about a murder on a train. It was Tessa’s favorite genre.

Once the movie started, he turned off the lights in the living room. They sat side by side, watching in silence. But Nathan knew she was holding back. He remembered how she used to be back when they were dating, and even after they got married. She’d always try to guess the plot, build her own theories, then get annoyed when she was wrong. Now, she didn’t say ...